With the shade open and the sun directly overhead in the summer time down here, it would be brighter times 10 and HOTTER too, with way more A/C load, which is something we don't need about 8 months out of the year. It's 86 degrees here today and my A/C is still getting a workout in mid October. Good news is . . . . another 2 or 3 mowings and I can quit cutting the grass around the end of November
My #1 decision to get a base Pro model was . . . . no glass roof!
Luckily, they make them both ways because what doesn't work for me is a big plus for other buyers. We spent 3 years in Germany, so I can well understand what the German engineers where thinking when they said "Lets get some light in here!"